Jon Hammar, the U.S. Marine imprisoned in Mexico on a gun charge, will be released today, his mother told Fox News Radio.

Olivia Hammar said the judge hearing Hammar's case issued a ruling in his favor and that her son is to be released at a time on Friday yet to be announced. No more details were available. Hammar, 27, who served in Iraq and Afghanistan, has been stuck in a notorious, drug cartel-controlled prison just 15 miles south of the U.S. border since Aug. 13, after he crossed into Mexico and declared an antique shotgun to Mexican customs officials.

News of his pending release came just a day after a letter surfaced from Mexico's ambassador to the U.S. that insisted Hammar's case would go to trial.

"This circumstance requires that he remain under detention during the duration of his trial," Arturo Sarukhan said in the letter.

Hammar, who was charged with a federal level weapon felony and faces up to 15 years in a Mexican prison for what his travel companion said was a breakdown in communication at the U.S.-Mexico border. He has been held in the notorious CEDES prison in Matamoros, Mexico, ever since. The prison is just 15 miles south of the border.

A friends brother got arrested in TJ for being a bounty hunter, even tho he was just there to get some beers and some gifts for his fam. He got a little too drunk and they arrested him when they found his bounty hunting license or whatever. He spent 2 years in prison down there while they locals extorted money from their family. "Pay us $10k He'll be out tomorrow", they pay, "That was just to cover the bribe on xyz official we need $10k more" so on and so forth.